NO. I POINT BARROW AMPHIPODA — SHOEMAKER 21 



shorter than antenna 2; peduncular joints decreasing consecutively 

 in length and thickness; flagellum a little longer than the peduncle 

 and composed of about seventeen joints. Antenna 2, third joint one- 

 half the length of the fourth, which is equal in length to the fifth; 

 flagellum short, a little longer than the fifth joint and composed of 

 II joints. 



Epistome prominent, projected forward and cleft in the center by 

 a deep sinus (fig. 6, h). Mandible with 3-jointed palp. Maxilla 

 I normal, inner lobe with i seta, palp i -jointed. Maxilla 2 normal. 

 Maxilliped normal. Gnathopod i slender; fifth and sixth joints 

 subequal in length; sixth joint with hind margin straight and without 

 palm ; seventh joint with a row of setae on inner margin. Gnathopod 2 

 moderately developed; sixth joint a little wider than the fifth and a 

 little shorter than the second, front and hind margins slightly convex, 

 and widest in the middle; palm oblique, a little shorter than hind 

 margin of joint, convex, bearing low wavy teeth, the central one of 

 which is the largest, defined by an angular process adjacent to which 

 is a shallow sinus bearing a spine; seventh joint fitting palm and 

 bearing a row of spinules on inner margin. 



Peraeopods i and 2 slender, much alike, i the longer. Peraeopod 3 

 slender and a little longer than peraeopod 4. Peraeopod 4 a little 

 longer than 5, second joint broadly expanded, fourth joint consider- 

 ably expanded with the hind corner dipping down almost to the end 

 of the fifth joint, fifth joint shorter than the sixth, seventh joint 

 strong and over half the length of the sixth. Peraeopod 5 very much 

 like peraeopod 4. 



Uropod I reaching a little farther back than 2 and uropod 2 a little 

 farther than 3. Uropod 3, peduncle about equal in length to the ramus 

 and armed on upper margin with a row of spines. Telson narrowly 

 oval in outline, armed on either margin with two spines, and reaching 

 about to the middle of the peduncle of uropod 3. Coxal plates 2 and 3 

 rather narrow, much deeper than their body segments, and bearing a 

 row of short spines on their hind margin. Length of male about 5 mm. 



Female. — The female is like the male, except a little smaller, and 

 the antennae are a little shorter. 



Type. — A male, U.S.N.M. No. 96250, taken in 175 feet of water 

 4 miles off Point Barrow base, Alaska, October 14, 1949, George E. 

 MacGinitie, collector. 



Remarks. — This new species is close to Metopa hruselii (Goes) 

 as figured by Sars (1892, pi. 92, fig. i). Metopa spinicoxa is a stouter 

 animal. The second gnathopod is more robust, with the palm armed 



